Solve 2021 Day 2 Part 1 in elixir

garritfra · garritfra · commit cde434804f3f · 2021-12-02T09:30:21.000+01:00
diff --git a/2021/Day2/Elixir/dive.ex b/2021/Day2/Elixir/dive.ex
@@ -0,0 +1,41 @@
+# iex()> Day1.first
+
+defmodule Dive do
+  def load_file() do
+    File.read!("../input.txt")
+    |> String.replace(" ", "\n")
+    |> String.split("\n", trim: true)
+  end
+
+  def dive(input) do
+    dive(input, {0, 0})
+  end
+
+  def dive([], {depth, horizontal}), do: depth * horizontal
+
+  def dive(["forward", amount_str | tail], {depth, horizontal}) do
+    amount = String.to_integer amount_str
+    dive(tail, {depth, horizontal + amount})
+  end
+
+  def dive(["down", amount_str | tail], {depth, horizontal}) do
+    amount = String.to_integer amount_str
+    dive(tail, {depth + amount, horizontal})
+  end
+
+  def dive(["up", amount_str | tail], {depth, horizontal}) do
+    amount = String.to_integer amount_str
+    dive(tail, {depth - amount, horizontal})
+  end
+
+  @spec first() :: Integer
+  def first() do
+    Dive.load_file
+    |> dive
+  end
+
+  @spec second([Integer]) :: Integer
+  def second(input) do
+    :second
+  end
+end
diff --git a/2021/Day2/Python/day2.py b/2021/Day2/Python/day2.py
@@ -19,7 +19,7 @@
     print(f"Product: {horizontal * depth}")
 
 # Part 2
-with open("input.txt") as f:
+with open("../input.txt") as f:
     lines = map(lambda l: l.strip(), f.readlines())
     aim = 0
     depth = 0
diff --git a/README.md b/README.md
@@ -1,11 +1,12 @@
 # Advent of Code
 
-This code may contain spoilers, if you haven't finished the puzzles over on https://adventofcode.com.
+This code may contain spoilers, if you haven't finished the puzzles over on
+https://adventofcode.com.
 
 ## Running
 
-Paste your input in a file named `input.txt` in the root of the project of the
-desired language. After that, follow the instructions for each language:
+Paste your input in a file named `input.txt` in the root of the project. After
+that, follow the instructions for each language:
 
 ### Rust
 
